Strange Power Door Lock Issue......

Just bought a '97 Cobra w/56K miles for a hobby. Taking care of a few odds and ends and have a question about chasing a power door lock issue. Remote works OK as does the inside switches and the key. Problem is that while the passenger side works fine, the driver side actuator seems to be dead . So, I just replaced it with no luck. I also checked all the fuses and all connections appear to be secure as well. Could the master door lock switch be faulty? Thanks for any suggestions/help!